Advanced 12 min
How can I run an SPF lookup for multiple domains at scale?
Use an asynchronous, rate-limited DNS worker pool that tracks SPF’s 10-lookup budget, parses mechanisms (include, redirect, a, mx, ptr.
Knowledge Base
Blog
Expert guides on SPF, DKIM, DMARC, and email security.
Intermediate 6 min
How to Fix SPF Fail Email Errors and Improve Deliverability
Diagnose SPF fail errors from Received-SPF headers and bounce messages, fix the root cause - wrong IPs, missing includes, duplicate records, or the 10-lookup limit - and keep deliverability steady.
Intermediate 8 min
Gmail SPF Record Setup: A Practical Guide for Google Workspace
Learn how to set up SPF records for Google Workspace - from the baseline include:_spf.google.com record to mapping third-party senders, managing DNS permissions, and avoiding the 10-lookup limit.
Intermediate 6 min
Valimail Alternatives for SPF Management in 2026
Comparing Valimail Instant SPF against AutoSPF, PowerDMARC, Redsift, DMARCLY, EasyDMARC, and MxToolbox. Feature comparison for teams evaluating Valimail alternatives.
Intermediate 6 min
DMARCLY Alternatives for SPF and DMARC in 2026
Comparing DMARCLY Safe SPF against AutoSPF, PowerDMARC, EasyDMARC, dmarcian, Redsift, and Valimail. Feature comparison with honest pricing and use-case guidance.
Intermediate 9 min
NIS2 vs DORA vs GDPR: A practical guide for EU businesses
Cybersecurity rules in the EU are getting stricter, and businesses can no longer treat them as optional.
Intermediate 6 min
EasyDMARC Alternatives for SPF and DMARC Management in 2026
Comparing EasyDMARC against AutoSPF, PowerDMARC, DMARCLY, dmarcian, Redsift OnDMARC, and Valimail for SPF and DMARC management. Feature comparison with honest use-case guidance.
Intermediate 12 min
What are the best practices for creating an SPF record that passes Kitterman SPF validation?
To create an SPF record that consistently passes Kitterman SPF validation, you must adhere strictly to RFC 7208 syntax (one TXT record starting with v=spf1).
Advanced 5 min
Automating SPF Record Management: A Smarter Approach For MSSPs
MSSPs often manage dozens or even hundreds of client domains, each with its own SPF configuration. Handling this manually can quickly become overwhelming.
Intermediate 8 min
PowerDMARC Alternatives for SPF Management in 2026
Comparing PowerDMARC PowerSPF against AutoSPF, MxToolbox, DMARCLY Safe SPF, Redsift Dynamic SPF, and Valimail Instant SPF for managing the 10-DNS-lookup limit. Honest feature comparison with pricing and use-case guidance.
Intermediate 9 min
Think Your SPF Is Fine? An SPF Validator Might Prove You Wrong
Yes - an SPF validator frequently uncovers hidden errors (lookup-limit breaches, missing or mistyped includes, misordered mechanisms, permissive all.
Intermediate 8 min
A Guide On Preventing Your Emails From Getting Placed In Spam Folders
Getting emails into the inbox is not just about writing a good message; it’s about proving, again and again, that your emails deserve to be there.
Foundational 7 min
Best Free SPF Checker Tools in 2026: Detailed Comparison
A side-by-side comparison of the 8 best free SPF record checker tools in 2026 - AutoSPF, MxToolbox, dmarcian, EasyDMARC, DMARCLY, PowerDMARC, Mailtrap, and DNS Checker. Each tool tested against the same domain with real results.
Foundational 8 min
SPF Record Examples: Copy-Paste Records for Google, Microsoft 365, SendGrid & More (2026)
Copy-paste SPF TXT records for the 10 most common email vendor combinations. Each example shows the exact DNS record, the lookup count, and what to watch out for.
Intermediate 12 min
What is the most common SPF checker finding that indicates misconfigured include statements?
The most common SPF checker finding that indicates misconfigured include statements is that the included domain publishes no SPF record (e.g., include:vendor.
Intermediate 8 min
Understanding Gmail’s HIPAA Compliance: What Businesses Must Know
HIPAA compliance means protecting sensitive patient data, also called protected health information or PHI.
Advanced 12 min
What limitations should I be aware of when relying on an SPF record tester?
SPF record testers are valuable diagnostics but they can mislead you because they may not fully enforce the 10-DNS-lookup limit (especially with nested.
Foundational 10 min
What Is RFC 7208? Understanding The SPF Standard Behind Email Authentication
RFC stands for Request for Comments, a series of documents used by the Internet community to publish technical guidelines, protocols.
Intermediate 14 min
From DNS to Deliverability: Why an SPF Record Tester Matters
An SPF record tester matters because it verifies your DNS-published sender authorizations end-to-end.
Advanced 12 min
How can I interpret the results from an SPF record checker if I see multiple include mechanisms?
If an SPF checker shows multiple include mechanisms, interpret each as a delegated check of another domain’s SPF that is evaluated left-to-right for the same.
Intermediate 5 min
CNAME vs Alias records: Here’s what you should know about them
Email ecosystems these days are no longer limited to only a couple of email servers.
Advanced 12 min
What are the best practices illustrated by an SPF record example to avoid DNS lookup limits?
The best practices to avoid SPF DNS lookup limits are to use only necessary lookup‑triggering mechanisms, prefer ip4/ip6 literals and CIDR ranges.
Intermediate 5 min
NCSC is retiring Web Check and Mail Check: Here’s what it means for security teams
Back in 2017, when the web wasn’t as structured as it is today from a security standpoint.
Intermediate 12 min
How can I interpret the results of an SPF lookup to find configuration errors?
You can interpret SPF lookup results to find configuration errors by parsing the record’s mechanisms and qualifiers in order.
Intermediate 6 min
How To Set Up SPF For Avanan: Here’s What You Should Know
It’s 2026, and companies no longer use traditional on-premise email servers; they have now moved to cloud platforms like Microsoft 365 and Google Workspace.
Advanced 13 min
Advanced SPF Record Testing: Protect Your Domain from Permerror Issues
To protect your domain from SPF permerror issues, enforce strict syntax validation.
Foundational 12 min
SPF Lookup in 2026: Best Practices for Secure Email Authentication
In 2026, the best practices for secure SPF lookups are to keep SPF within the 10-DNS-lookup limit by optimizing and (selectively) flattening includes.
Intermediate 9 min
Why Email Delivery Fails - and How to Fix It (2026)
From hard bounces to silent drops, email delivery fails for many reasons. Learn the most common causes and how to fix email deliverability in 2026.
Advanced 12 min
What are the best practices an SPF record generator should enforce for reliability?
An SPF record generator should enforce RFC 7208-compliant syntax and semantics; cap and flatten DNS lookups to stay under the 10-lookup limit; manage record.
Intermediate 6 min
550 From address violates UsernameCaseMapped Policy: Why does this happen, and how to fix it?
For an email to reach the recipient, it must meet the specific requirements set by the receiving server, which govern address syntax, authentication.
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